Fate/Grand Order: Zettai Majuu Sensen Babylonia

Synopsis

After one month of performing menial tasks, Ritsuka and Mash are assigned by Gilgamesh to investigate the neighboring city of Ur. They travel there with Merlin and Ana, where both Ritsuka and Merlin suspect the Grail in Gilgamesh's possession is not the cause of the Seventh Singularity. They then have a brief and confusing encounter with a woman calling herself "Jaguar Warrior" before she disappears. Upon arriving at Ur, the residents claim they are in no danger and do not require Gilgamesh's protection. Merlin deduces that the people of Ur had made a deal with a god for protection in return for daily sacrifices, observing the absence of men among the population. The residents confirm his theory, pointing out they have no way of opposing a god. Jaguar Warrior then attacks, revealing she hasn't killed the sacrificed men, only put them into forced labor for her own purposes. Mash and Ana attempt to fight back, but are outmatched. Ritsuka is forced to call a retreat back to Uruk, and promises to return to save Ur. The next day, Gilgamesh meets them at their headquarters.

(Source: Wikipedia)